CODE EXAMPLE FOR SHELL

exception: unable to run "adb", check your android sdk installation and android_sdk_root environment variable:

(By the way I googled this)

Reinstalling the platform tools might fix this problem.
Open Android Studio, click SDK Manager in the toolbar or click Tools > SDK Manager,
click SDK Tools, then uncheck Android-SDK Platform-Tools (as shown above).
After this, open C:UsersUsernameAppDataLocalAndroidSdk and delete the platform-tools folder.